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Finding the Fourth Proportional to 648, 894.15 and 399.36

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Solution

The fourth proportional to 648, 894.15 and 399.36 is: 551.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    648 : 894.15 = 399.36 : x
  2. Step 2: Convert to fraction form
    648/894.15 = 399.36/x
  3. Step 3: Cross multiply
    648x = 894.15 × 399.36
  4. Step 4: Simplify right side
    648x = 357,087.74
  5. Step 5: Solve for x
    x = 357,087.74/648
  6. Step 6: Final answer
    x = 551.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.